{{:Page 2}}
This includes the page called [[Page
2]] from Main namespace.
{{:/Page 2}}
This includes the page called
[[:/Page 2]] (with slash at the page
title start). If you write {{/Page 2}}, you will get the transclusion
of subpage called "Page 2". This works only for namespaces with
subpage functionality enabled, if you need this where it is not,
{{:{{FULLPAGENAME}}/Page 2}} will help you.
{{:Parent Page/Page 2}}
This includes the page
called [[Parent Page/Page 2]]. In this case,
you probably want {{../Page 2}} (again, you need a subpage
functionality for this).
and while some of these will include a link, none
include the page text.
Are these links blue? Have you tried to follow them if
they're not?
— Kalan